Numerical Study on the Role of Basin Geometry and Kinematic Seismic Source in 3D Ground Motion Simulation of the 22 February 2011 Mw 6.2 Christchurch Earthquake

Guidotti, Roberto; Stupazzini, Marco; Smerzini, Chiara; Paolucci, Roberto; Ramieri, Paolo

doi:10.1785/gssrl.82.6.767

Cited by 48 publications

(51 citation statements)

References 23 publications

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“…Pressure release through the leaky artesian system may have amplified the local predisposition for liquefaction in the eastern suburbs caused by the character of shallow formations (strength, grain size, density, etc. ), the shallow groundwater table and a basin geometry that locally amplified the shaking (as outlined by Brown & Weeber 1992;Cousins & McVerry 2010;Cubrinovski & Green 2010;Cubrinovski et al 2011;Green et al 2011;Guidotti et al 2011). The M W 7.1 Darfield earthquake had a different sense of motion and stress characteristics from the major aftershocks in 2011 (22 February M W 6.2, 23 June M W 5.3 and M W 6.0), which resulted in very different local shaking intensities (Cousins & McVerry 2010;CA Williams et al 2011;Fry et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Cox

Rutter

Sims

et al. 2012

New Zealand Journal of Geology and Geophysics

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Section: Discussionmentioning

confidence: 99%

Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Cox

Rutter

Sims

et al. 2012

New Zealand Journal of Geology and Geophysics

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“…For example, Semblat et al (2005) study the influence of the complexity of the media geometry when computing the 2-D Volvi basin response in Greece. Guidotti et al (2011) assess the role of basin geometry and kinematic seismic source in 3-D ground motion simulation of the 2011 February 22 M w 6.2 Christchurch earthquake. In addition, Gelagoti et al (2010) analyse numerically the effects of material constitutive model (linear and non-linear) and source input motion on the 2-D basin response at the Ohba valley in Japan through an aggravation factor defined as the ratio of peak ground accelerations from the 2-D and 1-D analyses.…”

mentioning

confidence: 99%

Influence of a sedimentary basin infilling description on the 2-D P–SV wave propagation using linear and non-linear constitutive models

Gelis¹,

Bonilla

2014

Geophysical Journal International

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S U M M A R YNumerical modelling is a useful tool to understand the role of different parameters (site geometry, impedance contrast, material properties, constitutive model, input motion) governing site effects. We focus here on the 2-D P-SV seismic wave propagation in a simple-shaped asymmetric model. We consider two ways of describing the sedimentary infilling properties: the basin is either composed of distinct homogeneous geological layers or is described through properties progressively changing as a function of depth (smooth model). In order to study the wave propagation in the two basins with similar soil properties, P and S velocities of the layered basin are deduced from the smooth basin ones, making both models compatible in a kinematic point of view. P and S velocities globally increase with depth. Following EPRI, non-linear properties are considered as constant in layers for the two basins. We assess the influence of the model choice on the wave propagation while taking into account linear and non-linear constitutive models. We test the influence of the input motion by propagating two different input motions, the first being a simple impulsive one and the second a real complex accelerogram. We find that transfer functions computed in each basin are quite similar irrespective of the soil constitutive behaviour and the input motion. Moreover, we show that the maximum shear strain spatial distribution depends on the input motion frequency content and maximum values depend on the input motion strength and complexity. Maximum shear strains are generally higher for superficial layers than for deeper ones. We show that the highest shear strain values are located above discontinuities, where velocities are lower and the soil is more non-linear than in the underlying layer, regardless of the input motion. Indeed, in a layered basin, the shear strain is higher above interfaces for all the soil constitutive models that were used. In the smooth visco-elastoplastic model, a kind of layering appears, absent in a viscoelastic model, due to the different non-linear properties in each layer. Moreover, no matter what the model structure and the input motion used, maximum shear strain levels are higher in the visco-elastoplastic soil than in the viscoelastic one. Such a numerical study helps to understand the non-linearity location and therefore the consequences of a model choice when performing a site-specific study.

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“…A 3D numerical model of the Canterbury Plains, New Zealand, was constructed which includes the city of Christchurch, part of the Canterbury Plains and of the Banks Peninsula, extending over an area of about 45 Â 45 Â 20 km, and combines: (i) a horizontally layered deep crustal model as well as a reliable description of the alluvial-bedrock interface based on the available geological map and studies in the literature (Forsyth et al 2008;Bradley 2012); (ii) the surface topography; (iii) a simplified velocity model of the Canterbury plain, filled with Quaternary deposits, For sake of brevity, we refer the reader to the results published by Guidotti et al (2011), based on a preliminary numerical model of the basin. We limit ourselves here to show in (Fig.…”

Section: The Canterbury Plains New Zealandmentioning

confidence: 99%

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Paolucci

Mazzieri

Smerzini

et al. 2014

Geotechnical, Geological and Earthquake Engineering

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With the ongoing progress of computing power made available not only by large supercomputer facilities but also by relatively common workstations and desktops, physics-based source-to-site 3D numerical simulations of seismic ground motion will likely become the leading and most reliable tool to construct ground shaking scenarios from future earthquakes. This paper aims at providing an overview of recent progress on this subject, by taking advantage of the experience gained during a recent research contract between Politecnico di Milano, Italy, and Munich RE, Germany, with the objective to construct ground shaking scenarios from hypothetical earthquakes in large urban areas worldwide. Within this contract, the SPEED computer code was developed, based on a spectral element formulation enhanced by the Discontinuous Galerkin approach to treat non-conforming meshes. After illustrating the SPEED code, different case studies are overviewed, while the construction of shaking scenarios in the Po river Plain, Italy, is considered in more detail. Referring, in fact, to this case study, the comparison with strong motion records allows one to derive some interesting considerations on the pros and on the present limitations of such approach.

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Numerical Study on the Role of Basin Geometry and Kinematic Seismic Source in 3D Ground Motion Simulation of the 22 February 2011 Mw 6.2 Christchurch Earthquake

Cited by 48 publications

References 23 publications

Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Influence of a sedimentary basin infilling description on the 2-D P–SV wave propagation using linear and non-linear constitutive models

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

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Numerical Study on the Role of Basin Geometry and Kinematic Seismic Source in 3D Ground Motion Simulation of the 22 February 2011 Mw 6.2 Christchurch Earthquake

Cited by 48 publications

References 23 publications

Hydrological effects of theMW7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Hydrological effects of theMW7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Influence of a sedimentary basin infilling description on the 2-D P–SV wave propagation using linear and non-linear constitutive models

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

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Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand

Hydrological effects of theM_W7.1 Darfield (Canterbury) earthquake, 4 September 2010, New Zealand